Which of the following is the most radiosensitive ovarian tumors:

“Below the age of 20 years 60% of the tumours are of germ cell origin and in girls under the age of 10 years almost 85% are of germ cell origin and are invariably malignant.” “Dysgerminoma is the most common malignant germ cell tumour accounting for about 40% of all ovarian cancers of germ cell origin.” “Dysgerminomas are the most common malignant germ cell tumours of the ovary and have been considered the female - equivalent of seminoma.” Most common germ cell tumour of ovary is dermoid cyst (mature teratoma). It is benign in nature. Remember: • Most common ovarian tumour (overall) – Epithelial cell tumour. • Most common tumour in young woman is – Germ cell tumour.  • Most common malignant tumour of ovary – Serous cystadenocarcinoma. • Most common benign tumour of ovary (overall) – Dermoid cyst.  • Most common benign epithelial tumor of ovary – Serous cystadenoma.  • Most common germ cell tumour – Mature teratoma (Dermoid cyst). • Most common malignant GCT – Dysgerminoma. • Most common ovarian tumour in pregnancy (but in remains undiagnosed) – Serous cystadenoma. • Most Common benign tumour diagnosed in pregnancy – Dermoid cyst. • Overall most common ovarian tumour diagnosed in pregnancy – Dermoid cyst. • Most common malignant ovarian tumor detected during pregnancy – Dysgerminoma. • Germ cell Tumor with best pregnosis Dyserminoma • Germ cell tumor with worst prognosis- endodermal sinus tumor • Germ cell tumor which has maximum bilaterality– Dysgerminoma • Germ cell tumor which presents as accute abdomen- Endodermal Sinus Tumor • Most common ovarian tumour to undergo torsion during pregnancy – Dermoid cyst. • Most common ovarian tumour to involve opposite ovary by metastasis – Granulosa cell tumour. • Most radiosensitive ovarian tumour – Dysgerminoma. • Most rapidly growing ovarian tumour – Yolk sac Tm- (Endodermal Sinus Tumor) • Most connective tissue tumour – Fibroma. Ovarian Tumour: Causing: • Pseudomyxoma peritonei – Mucinous cystadenoma. • Meig’s syndrome – Ovarian fibroma • Pseudomeig’s syndrome: – Brenner’s tumour – Granulosa cell tumour – Thecoma • Ovarian tumour associated with hyperpyrexia and hypercalcemia – Mesonephroid tumour. • Ovarian tumour arising from epithelium of urinary tract – Brenner Tm • Feminizing tumours: – Granulosa cell tumour – Theca cell tumour – Fibromas • Virilising tumour: – Androblastoma – Hilus cell Tm – Gynadroblastoma – Adrenal cortical tumour • Largest benign ovarian Tm – Mucinous cyst adenoma • Mucinous tumours are associated with: – Dermoid cyst (MBD) – Brenner’s tumour • Tumour with lymphocytic infilteration: